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April 2012
PFN
Techniques for Interconnecting Smart Wireless
Gateways to ProSoft RadioLinx® Devices
EMERSON WIRELESS NETWORKS:
PERVASIVE FIELD NETWORKS
Pervasive Field Networks (PFN) are a straight forward solution
to collecting and sending field data back to the right place.
This paper is to assist with the installation of ProSoft
RadioLinx devices with Smart Wireless Gateways for use in a
PFN.
INTRODUCTION
Before beginning the installation of a ProSoft PFN it is
recommended the installer view the video at the
following location on the Internet:
http://www.prosofttechnology.com/training/EmersonVi
deo/Pervasive_Field_Network/Emerson_Smart_Netw
ork_9.html
This video gives a good overview of the PFN, ProSoft,
Smart Wireless, and considerations for installing.
Referenced in this video is ProSoft’s Wireless
Designer software. The use of this program will help
the installer pick the correct model of ProSoft radio
needed.
www.rosemount.com
The model of ProSoft radio referenced in this white
paper is RadioLinx RLIX-IHN-W(C). If a different radio
model is used, the installer should compare the two
radios and note any differences.
The installation and wiring information given in this
document is for “typical” installations. Local
regulations and codes have precedence and must be
adhered too if they differ from this installation guide.
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PFN
OVERVIEW
The ProSoft RadioLinx radio has two ways of being
powered. One way is through its Ethernet PoE port
and the other way of powering is through a separate
power connector. See Appendix B for physical
details.
The input ratings of the two power ports are:
•
The power supply for the PoE port is to be
rated at 48 VDC, 0.35Amp IEEE 802.3af
compliant (overall power consumption is under
6 Watts continuous.)
•
The power supply for the power port is 10 to
24 VDC and rated for at least 6 Watts
continuous operation.
To connect and power the Gateway and the
RadioLinx device the installer has a number of
choices. These choices differ by where and what is
the ultimate source of power, i.e., AC mains, battery,
or 12 or 24 VDC power.
The Gateway works from a range of 10 to 30 VDC
and is rated for 3.3 Watts continuous operation. The
Gateway has a power bridge internal between its
input power connector and the powered Ethernet
port on the gateway. In this way, the voltage
impressed upon the input power connectors on the
Gateway can be routed down the Ethernet cable
through the powered Ethernet connector. So if the
gateway is powered by a 12 VDC source, 12 VDC
will be routed to the powered Ethernet port and down
the Ethernet cable. The Gateway powered Ethernet
connector is not an IEEE 802.3af source. The
maximum current rating of the internal power bridge
in the Gateway is 0.33 Amps DC.
RECOMMENDED CONFIGURATIONS
There are 3 possible wiring configurations for
connecting the Gateway to the ProSoft radio
(assuming the power source is at the Gateway).
1. 12 VDC only Separate Wires (See Appendix A
Wire Routing Diagram 1: Separate Wires)
This configuration lends itself well to a single 12
or 24 VDC power source such as you would find
in a solar powered or UPS/battery powered
application. In this application, two separate
cables are run: one for power and one for the
Ethernet. Connections are made as shown in
Appendix A Wire Routing Diagram 1: Separate
Wires.
2. 12 VDC only Combined Wires (See Appendix
A Wire Routing Diagram 2: Combined Wires)
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This configuration also lends itself well to a
single 12 or 24 VDC power source such as you
would find in a solar powered or UPS/battery
powered application. In this application, one
cable is run for both power and Ethernet.
Connections are made as shown in Appendix A
Wire Routing Diagram 2: Combined Wires.
While this configuration allows for one cable, it
does have the inconvenience of requiring the
installer to make up a splitter. Typically category
5e Ethernet cable using 24 AWG conductors is
sufficient to handle these voltages and current
levels described for this application. Please
check local regulations and codes and the
supplier of the actual cable for actual limits and
ratings.
3. Wired for PoE 802.3af (See Appendix A Wire
Routing Diagram 3: Wired for PoE)
This configuration requires a 48 VDC power
source. ProSoft offers several such power
sources (sometimes called PoE injector).
Please contact your ProSoft representative to
determine the best model of PoE injector for
your particular model RadioLinx unit. In this
application, one cable is run on for power and
Ethernet. Connections are made as shown in
Appendix A Wire Routing Diagram 3: Wired for
PoE.
WHAT IS POE AND IEEE 802.3AF?
The term PoE can be confusing, especially when
comparing older equipment (equipment made before
June 2003). While it means “power over the Ethernet
(cabling)” the specifics of the power can be different.
In June of 2003 the IEEE adopted specification IEEE
802.3af. Since then, this has generally become the
industry standard for supplying power over Ethernet
wiring. In 2009 the specification was modified to
accommodate higher power levels. There are older
pieces of equipment and power sources listed as
“PoE” that are incompatible with IEEE 802.3af. If
installing into an existing system with PoE, please
check the version PoE utilized. The IEEE
specification defines sending 48 VDC down the
Ethernet cabling to power another unit. The specific
wiring for this depends whether the unit is IEEE
802.3af active (power sent on data pairs) or IEEE
802.3af passive (power sent on spare wires).The
ProSoft RadioLinx radio listed is IEEE 802.3af
compliant. If using this feature on the RadioLinx unit,
please follow the ProSoft recommended wiring for
your specific model.
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APPENDIX A
Wire Routing Diagram 1: Separate Wires
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Wire Routing Diagram 2: Combined Wires
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Wire Routing Diagram 3: Wired for PoE
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APPENDIX B
Connectors and Pin outs
Gateway Ethernet/PoE connector; pin out
connections listed
RadioLinx connectors; pin out connections listed
Standard Terms and Conditions of Sale can be found at www.rosemount.com/terms_of_sale
The Emerson logo is a trade mark and service mark of Emerson Electric Co.
Rosemount and the Rosemount logotype are registered trademarks of Rosemount Inc.
RadioLinx is a registered trademark of ProSoft Technology, Inc.
All other marks are the property of their respective owners.
© 2012 Rosemount Inc. All rights reserved.
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Rosemount Measurement
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